The iswlower() function is the wide-character equivalent of the
islower(3) function. It tests whether wc is a wide character
belonging to the wide-character class "lower".
The wide-character class "lower" is a subclass of the wide-character
class "alpha", and therefore also a subclass of the wide-character
class "alnum", of the wide-character class "graph" and of the wide-
character class "print".
Being a subclass of the wide-character class "print", the wide-
character class "lower" is disjoint from the wide-character class
"cntrl".
Being a subclass of the wide-character class "graph", the wide-
character class "lower" is disjoint from the wide-character class
"space" and its subclass "blank".
Being a subclass of the wide-character class "alnum", the wide-
character class "lower" is disjoint from the wide-character class
"punct".
Being a subclass of the wide-character class "alpha", the wide-
character class "lower" is disjoint from the wide-character class
"digit".
The wide-character class "lower" contains at least those characters
wc which are equal to towlower(wc) and different from towupper(wc).
The wide-character class "lower" always contains at least the letters
'a' to 'z'.

The behavior of iswlower() depends on the LC_CTYPE category of the
current locale.
This function is not very appropriate for dealing with Unicode
characters, because Unicode knows about three cases: upper, lower and
title case.

This page is part of release 5.00 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2015-08-08 ISWLOWER(3)